kelly



(No Model.) 2 Sheets-Sheet I. J. P. KELLY & P. H. BRANGS.

REGULATOR FOR ELECTRIC MOTORS 7 No. 407,014. Patented July 16, 1889 ATTORNEY? (No Model.) 2 Sheets-Sheet 2. J. F. KELLY & P. H. BRANGSS REGULATOR FOR ELECTRIC MOTORS.

No. 407,014. Patented July 16, 1889.,

WITNESSES: .efimuz ATTORNEYS 5 tures of this apparatus.

UNITED STATES PATENT OFFICEt JOHN F. KELLY, OF NEIY YORK, N. Y., AND PAUL II. BRANGS, OF NEIVARK, NETV JERSEY, ASSIGNORS TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEIY YORK, N. Y.

REGULATOR FOR ELECTRIC MOTORS.

SPECIFICATION forming part of Letters Patent No. 407,014, dated July 16, 1889.

Application filed July 31, 1888. Serial No. 281,669- (No model.)

To all whom it may concern.-

Be it known that we, JOHN F. KELLY and PAUL H. BRANGS, citizens of the United States, residing at New York, in the county and State 5 of New York, and in Newark, in the county IO fication, reference being had to the drawings accompanying and forming a part of the same.

This invention is an improvement in regulators for electromagnetic motors. It is especially designed for use with shunt-wound elec tro-magnetic motors, and more particularly with such motors when run in series in the same circuit. It maybeapplied to other purposes; but as they are well understood we have confined the description herein to the special parts in which the invention resides.

In Patent-No. 316,089, granted to the United States Electric Lighting Company, there is shown an automatic regulator for dynamoelectric machines in which two oppositelyacting pawls are oscillated by a driven shaft and eccentric. An electro-magnet which. is included in the main circuit operates to maintain one or the other, or both, pawls out of engagement with two ratchet-wheels, and to 0 thereby varyand control the resistance in the field-circuit of the machine or generator in order to preserve a constant or uniform current in the main circuit. The present invention follows in certain respects the main fea- It differs mainly from it in such particulars as better adapt it for use with motors under the conditions above statedthat is to say, it has two pawls or their equivalents, which are continually oscillated by a suitable source of power; but,

instead of the electromagnet, the device for controlling the action of the pawls is a centrifugal governor driven by the motor. The advantages of this are mainly that the con trol of the rheostat is rendered very sensitive,

since there is practically no variation of load upon the governor, and we further secure a much wider range of movement of the resistance varying mechanism that can practically be obtained by the centrifugal governor alone or in conjunction with the ordinary levers.

Another feature of the invention resides in the fact that in lieu of supporting both pawls on the same lever and oscillating them by the same eccentric or crank we employ two pawls carrying arms or levers, one of which has a wider range of oscillation than the other, so that when the pawl is permitted to engage with its ratchet-wheel a quicker motion will he imparted to the wheel than the other receives from engagement with the other pawl. This quicker motion we use to throw resistance into the field of the motor, so that no injury will be caused by the speed of the motor increasing greatly 011 account of a large and sudden decrease in load before the regulator has time to check it.

Referring to the drawings, Figures 1 and 2 are two side elevations at right angles of the operative portions of the apparatus.

A is a metal frame-work which is to be mounted 011 a suitable stand near the motor.

B is a pulley-wheel on a shaft mounted in the frame, and is driven by a belt or cord from any moving shaft or source of power most convenient. This shaft carries two cranks or eccentrics C D, with which engage, respectively, the bifurcated arms E F.

G is a second shaft mounted in the frame A above the other. At one end there is secured to it the arm II, carrying contact strips or springs that are caused to sweep over the circular series of terminal plates of a rheostat in the ordinary manner, said rheostat beingin the field-circuit of the motor, as set forth in Patent No. 278,640, May 29,1883. On the other end of shaft G and secured thereto are two ratchet-wheels I J, with teeth turned in opposite directions. The arms E F extend from sleeves K L, fitting loosely on the shaft G. From these sleeves also extend arms M N, carrying at their ends pawls c d, adapted to engage, respectively, with the ratchet-wheels I J. By applying power to turn the pulley B the pawls c (l are oscillated, the pawl (1 having a longer throw than pawl cfor eX-' ample, it may move its ratchet three or four or more teeth, while pawl 0 moves its ratchet but one tooth at a time. It is obvious that the ordinary friction-wheels and pawls would be the equivalentsof those shown, and that any form of pawl or pusher may be used.

0 is a pulley designed to be driven by the motor and imparting motion through bevelgears I to the centrifugal governor R. The weighted arms of the governor connect with a weighted sleeve S, to which is connected a lever T, pivoted to the frame A.

,U is a bell-crank lever pivoted to the frame A and carrying two arms e f, from which extend pins under the two pawls 0 cl. The end of lever U is connected by a link V with the lever T, so that when the governor-balls rise or fall the lever U will be turned on its pivot, raising or lowering the arms cf, as the case may be, and permit one or the other of the pawls c d to engage with its ratchet. When in its proper position, the lever U maintains both pawls out of engagement with theratchets.

In so far as the feature of the two pawls of unequal throw is concerned we regard as within our invention any form of governor for controlling themin other words, an electro-magnet or other device which will be differently affected by variations in the speed of the motor.

As the position of the governor depends upon the speed of the motor and controls the action of the pawls, so that the resistance of the field of the motor is increased, lowered, or

kept uniform, the speed of the motor will'be maintained uniform by this apparatus.

What we claim is'- 1. In a regulating mechanism for electromagnetic motors, the combination, with a driven shaft formed or provided with two eccentrics or cranks of unequal throw, of two oppositelyracting pawls or pushers oscillated by the cranks, wheels for shifting the position of a rheostat-arm when moved by one or the other of the pawls, and a governor operated by the motor for controlling the action of the pawls, as set forth.

2. In a regulating mechanism for electromagnetic motors, the combination, with a driven shaft formed or provided with two cranks or eccentrics of unequal throw, of two oppositely-acting pawls mounted on arms oscillated by the cranks, two ratchet-wheels under the pawls and adapted to shift a rheostat-arm when moved by the paw1s, stops for maintaining the pawls in an elevated position, or out of engagement with the ratchets, a centrifugalgovernor adapted to be run by the motor, and connections for raising and lowering the pawls according to its speed of rotation, as herein set forth.

JOHN F. KELLY. P. H. BRANGS. WVitnesses:

- THOMAS C. PROVOST, ADOLPI-IUS M. AKE. 

